Stuffed Turkey Breast

1 medium onion, finely chopped
1/2 cup butter or margarine
1 cup water
2 chicken bouillon cubes
1 teaspoon poultry seasoning
2 teaspoons dried parsley
8 slices stale bread, cut into 1/2-inch cubes
1 (6 pound) whole turkey breast
1/4 teaspoon salt
1/4 teaspoon ground black pepper
1/4 cup butter or margarine, melted

Saut